Upgrade from 5.1.6 to 9

[Samuel DeVore]

On Monday, October 21, 2002, at 02:41  AM, Jake Savin wrote:

> On Wednesday, October 16, 2002, at 07:31 AM, Eric Soroos wrote:
>
>> At some point in the past there was a slight change in the db format 
>> (6.1 era) that _may_ make it a one way trip for your databases. New 
>> versions will open old roots, but I can't be 100% sure of the 
>> reverse. I'm pretty sure that you can drop an frontier9 app into the 
>> frontier 5 folder and start everything up if you have to. But I'd 
>> rather have the backups.
>
> If I recall correctly, the database file format *did* change around 
> 6.x, though I'm not sure exactly what version. It's also true that 
> newer versions of the Frontier app will open older databases, but the 
> reverse is probably not true. This is from memory n-grams encoded 
> before I started working at UserLand, but I'm pretty sure this is the 
> case.

Yes but the older versions of Frontier can import exported tables from 
new style roots so there are way to back track even after upgrading.

Sam D
>
> Regardless, Eric's right -- make sure you back up your entire Frontier 
> installation before attempting to upgrade.
>
> -Jake
>
>
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